Glycol monoethyl ether → 4-(4-Chloro-5-methoxy-2-methylanilino)-7-methoxy-8-(chloroethoxy)benzo[g]quinoline-3-carbonitrile

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A mixture of 248 mg (0.714 mmol) of 4-chloro-7-methoxy-8-(2-chloroethoxy)benzo[g]quinoline-3-carbonitrile and 4-chloro-8-methoxy-7-(2-chloroethoxy)benzo[g]quinoline-3-carbonitrile (1:1 mixture), 10 mg of pyridine hydrochloride, 150 mg (0.874 mmol) of 4-chloro-5-methoxy-2-methylaniline and 5 mL of 2-ethoxyethanol is stirred and heated to 135° C. After 1 hour, the reaction is cooled to room temperature, quenched with 0.2 mL of triethylamine and concentrated in vacuo. The residue is dissolved in 1:1 hexane/ethyl acetate with a little dichloromethane and chromatographed on silica gel eluting with 1:1 hexane/ethyl acetate, then ethyl acetate to provide 0.282 g of 4-(4-chloro-5-methoxy-2-methylanilino)-7-methoxy-8-(chloroethoxy)benzo[g]quinoline-3-carbonitrile and 4-(4-chloro-5-methoxy-2-methylamino)-8-methoxy-7-(chloroethoxy)benzo[g]quinoline-3-carbonitrile (1:1 mixture) as a dull yellow solid (81%), m.p. 132-68° C. dec.

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